gecko/layout/style/nsDOMCSSAttrDeclaration.cpp

188 lines
5.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* DOM object for element.style */
#include "nsDOMCSSAttrDeclaration.h"
#include "nsCSSDeclaration.h"
#include "nsIDocument.h"
#include "nsIDOMMutationEvent.h"
#include "nsICSSStyleRule.h"
#include "nsICSSLoader.h"
#include "nsICSSParser.h"
#include "nsIURI.h"
#include "nsINameSpaceManager.h"
#include "nsStyleConsts.h"
#include "nsContentUtils.h"
#include "nsIContent.h"
#include "nsIPrincipal.h"
nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(nsIContent *aContent)
{
MOZ_COUNT_CTOR(nsDOMCSSAttributeDeclaration);
// This reference is not reference-counted. The content
// object tells us when its about to go away.
NS_ASSERTION(aContent && aContent->IsNodeOfType(nsINode::eELEMENT),
"Inline style for non-element content?");
mContent = aContent;
}
nsDOMCSSAttributeDeclaration::~nsDOMCSSAttributeDeclaration()
{
MOZ_COUNT_DTOR(nsDOMCSSAttributeDeclaration);
}
NS_IMPL_ADDREF(nsDOMCSSAttributeDeclaration)
NS_IMPL_RELEASE(nsDOMCSSAttributeDeclaration)
void
nsDOMCSSAttributeDeclaration::DropReference()
{
mContent = nsnull;
}
nsresult
nsDOMCSSAttributeDeclaration::DeclarationChanged()
{
NS_ASSERTION(mContent, "Must have content node to set the decl!");
nsICSSStyleRule* oldRule = mContent->GetInlineStyleRule();
NS_ASSERTION(oldRule, "content must have rule");
nsCOMPtr<nsICSSStyleRule> newRule = oldRule->DeclarationChanged(PR_FALSE);
if (!newRule) {
return NS_ERROR_OUT_OF_MEMORY;
}
return mContent->SetInlineStyleRule(newRule, PR_TRUE);
}
nsresult
nsDOMCSSAttributeDeclaration::GetCSSDeclaration(nsCSSDeclaration **aDecl,
PRBool aAllocate)
{
nsresult result = NS_OK;
*aDecl = nsnull;
if (mContent) {
nsICSSStyleRule* cssRule = mContent->GetInlineStyleRule();
if (cssRule) {
*aDecl = cssRule->GetDeclaration();
}
else if (aAllocate) {
nsCSSDeclaration *decl = new nsCSSDeclaration();
if (!decl)
return NS_ERROR_OUT_OF_MEMORY;
if (!decl->InitializeEmpty()) {
decl->RuleAbort();
return NS_ERROR_OUT_OF_MEMORY;
}
nsCOMPtr<nsICSSStyleRule> newRule;
result = NS_NewCSSStyleRule(getter_AddRefs(newRule), nsnull, decl);
if (NS_FAILED(result)) {
decl->RuleAbort();
return result;
}
result = mContent->SetInlineStyleRule(newRule, PR_FALSE);
if (NS_SUCCEEDED(result)) {
*aDecl = decl;
}
}
}
return result;
}
/*
* This is a utility function. It will only fail if it can't get a
* parser. This means it can return NS_OK without aURI or aCSSLoader
* being initialized.
*/
nsresult
nsDOMCSSAttributeDeclaration::GetCSSParsingEnvironment(nsIURI** aSheetURI,
nsIURI** aBaseURI,
nsIPrincipal** aSheetPrincipal,
nsICSSLoader** aCSSLoader,
nsICSSParser** aCSSParser)
{
NS_ASSERTION(mContent, "Something is severely broken -- there should be an nsIContent here!");
// null out the out params since some of them may not get initialized below
*aSheetURI = nsnull;
*aBaseURI = nsnull;
*aSheetPrincipal = nsnull;
*aCSSLoader = nsnull;
*aCSSParser = nsnull;
nsIDocument* doc = mContent->GetOwnerDoc();
if (!doc) {
// document has been destroyed
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsIURI> baseURI = mContent->GetBaseURI();
nsCOMPtr<nsIURI> sheetURI = doc->GetDocumentURI();
NS_ADDREF(*aCSSLoader = doc->CSSLoader());
nsresult rv = NS_OK;
// Note: parsers coming from a CSSLoader for a document already have
// the right case-sensitivity, quirkiness, etc.
rv = (*aCSSLoader)->GetParserFor(nsnull, aCSSParser);
if (NS_FAILED(rv)) {
return rv;
}
baseURI.swap(*aBaseURI);
sheetURI.swap(*aSheetURI);
NS_ADDREF(*aSheetPrincipal = mContent->NodePrincipal());
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSAttributeDeclaration::GetParentRule(nsIDOMCSSRule **aParent)
{
NS_ENSURE_ARG_POINTER(aParent);
*aParent = nsnull;
return NS_OK;
}